Re: Drift anchor?
A drift anchor is primarily used to slow a wind blown drift, where your boat is being blown faster than the water you're in is moving. It will not slow your drift if your drift speed is a result of the current you are in. The drift sock/anchor basically helps your drifting boat match the speed and direction of the water you are in.
I use one sometimes from the kayak on windy days, as it is light and easily affected by the wind.